JP2024023630A - Transmitting device, receiving device, transmitting method, receiving method and integrated circuit - Google Patents

Abstract

The present invention facilitates providing flexible reference signal settings for demodulation during repetition of a data channel. A transmitting device according to an aspect of the present disclosure, during operation, allocates data to a plurality of TTIs, including an initial transmission time interval (TTI) and one or more subsequent TTIs following the initial TTI; A circuit for obtaining a DMRS assignment indicating whether a DMRS is assigned to each of one or more subsequent TTIs, the plurality of TTIs each having a a circuit, represented by consecutive symbols, and a transceiver for transmitting data and DMRS to a receiving device in a slot during operation, the transmission of DMRS in one or more subsequent TTIs being performed according to a DMRS assignment; a transmitter/receiver configured to be transmitted, and symbols between TTIs are assigned symbols that are not valid for uplink transmission. [Selection diagram] Figure 16

Description

The present disclosure relates to transmission and reception, devices, and methods in communication systems, such as 3GPP (3rd Generation Partnership Project) communication systems.

Recently, the 3rd Generation Partnership Project (3GPP) completed the first release of technical specifications (Release 15) for next generation cellular technology, also referred to as 5th generation (5G). At the 3GPP Technical Specification Group (TSG) Radio Access Network (RAN) meeting #71 (Gothenburg, March 2016), Release 15 could define the first standard for 5G. As one work item, the first 5G study item "Study on New Radio Access Technology" involving RAN1, RAN2, RAN3, and RAN4 was approved. The purpose of the study is to develop "New Radio" (NR) access technologies specified during the RAN requirements study that operate in frequency bands up to 100 GHz and support a wide range of use cases. (See, eg, 3GPP TR 38.913 "Study on Scenarios and Requirements for Next Generation Access Technologies", current version 14.3.0, available at www.3gpp.org).

The International Telecommunications Union's IMT-1010 (International Mobile Telecommunications-2020) specification covers three main scenarios for next-generation mobile communications: enhanced mobile broadband (eMBB), large-scale machine-type communications ( Massive Machine-type Communications (mMTC) and Ultra-Reliable and Low-Latency Communications (URLLC) were broadly classified. In the recently completed 3GPP Release 15, the main focus was to standardize the specification for eMBB and initial support for URLLC. For example, eMBB deployment scenarios may include indoor hotspots, dense urban areas, suburban areas, urban areas, and high speeds. Deployment scenarios for URLLC may include industrial control systems, mobile health management (remote monitoring, diagnosis, and treatment), real-time control of vehicles, and smart grid wide area monitoring and control systems. mMTC may include scenarios using multiple devices with low delay sensitive data transmission, such as smart wearables and sensor networks.

In Release 15, the URLLC scope for reliability has expanded to include new CQI (Channel Quality Indicator) and MCS (Modulation (encoding method) including table design specifications. For URLLC, one new RRC parameter is introduced to configure a new RNTI (Radio Network Temporary Identifier) for grant-based transmission. If a new RNTI is not configured, the existing RRC parameter "mcs-table" is extended to select from three MCS tables (existing 64QAM MCS table, existing 256QAM MCS table, new 64QAM MCS table). If mcs-table indicates a new 64QAM MCS table, the existing 64QAM MCS table is used for DCI format 0_0/1_0 in CSS (Common Search Space), and DCI format 0_0/1_0/ in USS (User Search Space) is used. For 0_1/1_1, a new 64QAM MCS table is used. Otherwise, follow existing behavior. When a new RNTI (via RRC (Radio Resource Control)) is configured, RNTI scrambling of the DCI CRC is used to select the MCS table. If the DCI CRC is scrambled with the new RNTI, a new 64QAM MCS table is used. Otherwise, follow existing behavior. The above settings for DL (downlink) and UL (uplink) are separate.

The scope of URLLC reliability in Release 15 was quite limited. Therefore, RAN #80 approved a new consideration on physical layer enhancements for NR URLLC (see RP-181477 "New SID on Physical Layer Enhancements for NR URLLC", Huawei, HiSilicon, Nokia, Nokia Shanghai Bell). sea bream). Release 15 introduced basic support for URLLC. NR URLLC Rel. For No. 16, further use cases with more stringent requirements have been identified, such as factory automation, transportation industry, and power distribution.

One non-limiting exemplary embodiment facilitates providing flexible demodulation reference signal settings during data channel repetition.

In one general aspect, the techniques disclosed herein feature a transmitting device that transmits data to a receiving device in a communication system. During operation, a transmitting device allocates data to multiple TTIs, including an initial transmission time interval (TTI) and one or more subsequent TTIs following the initial TTI, and further assigns a demodulation reference signal (DMRS) to the initial TTI. Assignment: For each subsequent TTI of the one or more subsequent TTIs, circuitry is provided to obtain a DMRS assignment indicating whether DMRS is assigned to that subsequent TTI to be transmitted in addition to data. Each of the multiple TTIs includes fewer symbols than slots, and the data assigned to each of the multiple TTIs is the same. The transmitting device further comprises a transceiver that, in operation, transmits data assigned to the initial TTI and DMRS and data assigned to one or more subsequent TTIs to the receiving device within the slot. DMRS transmissions in one or more subsequent TTIs are performed according to the DMRS assignment.

It should be noted that the general embodiments or the specific embodiments can be implemented as a system, a method, an integrated circuit, a computer program, a storage medium, or any selective combination thereof.

Further benefits and advantages of the disclosed embodiments will become apparent from the specification and drawings. These benefits and/or advantages may be obtained individually by the various embodiments and features of this specification and drawings. However, not all of these features need to be provided in order to obtain one or more such benefits and/or advantages.

1 is a schematic diagram of an example architecture for a 3GPP NR system. FIG. 2 is a block diagram of an example user and control plane architecture for an LTE eNB, NR gNB, and UE. 1 is a schematic diagram showing a usage scenario of large-scale machine type communication (mMTC) and ultra-reliable low-latency communication (URLLC). FIG. 2 is a diagram of an example of inter-slot repetition of a 2-symbol PUSCH (Physical Uplink Shared Channel). FIG. 3 is a diagram of an example of repetition of a 4-symbol PUSCH within the same slot. FIG. 2 is a diagram of an example of an 8-symbol PUSCH including one additional DMRS (Demodulation Reference Signal). Diagram showing repetition with frequency hopping. Diagram showing repetition with beam hopping. The figure which shows an example of repetition on the measurement resource in the set grant. FIG. 6 is a diagram illustrating an example of 2-symbol PUSCH transmission with 6 repetitions within one slot. FIG. 2 is a block diagram of a transmitting device and a receiving device. Block diagram of the circuit of the transmitting device. Flowchart of a transmission method and a reception method. FIG. 3 is a diagram illustrating an example of removing DMRS symbols from a particular repetition within one slot. FIG. 3 is a diagram illustrating an example of replacement of DMRS symbols with data symbols in a particular repetition within one slot. FIG. 3 is a diagram illustrating an example of a combination of removal and replacement of DMRS symbols within one slot. 2 is a flowchart of an uplink transmission method and an uplink reception method. 7 is a graph illustrating example control signaling for DMRS assignments. The figure which shows an example of repetition with frequency hopping. FIG. 3 is a diagram showing an example of repetition involving beam hopping. The figure which shows an example of repetition on the measurement resource in the set grant.

As presented in the background section, 3GPP is committed to the development of fifth generation cellular technology, simply referred to as 5G, including the development of new radio (NR) access technologies operating at frequencies ranging up to 100 GHz. Working on the next release. 3GPP must identify and develop the technology components needed to successfully standardize NR systems that meet both immediate market needs and longer-term requirements in a timely manner. To achieve this, developments in radio interfaces and radio network architectures are being considered in the study item "New Radio Access Technology". Results and agreements are collected in technical report TR 38.804 v14.0.0, which is incorporated herein by reference in its entirety.

In particular, there are interim agreements on the overall system architecture. NG-RAN (Next Generation-Radio Access Network) includes gNB, which supports NG-Radio Access User Plane, SDAP/PDCP/RLC/MAC/PHY (Service Data Adaptation Protocol/Packet Data Convergence Protocol/Radio Link Control). /Medium Access Control/Physical) and control plane, providing RRC (Radio Resource Control) protocol termination towards the UE. The NG-RAN architecture is described in TS 38.300 v. 15.0.0, Section 4, as shown in FIG. gNBs are interconnected with each other by an Xn interface. The gNB also communicates with the NGC (Next Generation Core) by the Next Generation (NG) interface, more specifically by the NG-C interface, the AMF (Access and Mobility Management Function) (e.g. a particular core running the AMF). NG-U interface to a UPF (User Plane Function) (eg, a specific core entity running UPF).

A variety of different deployment scenarios are currently being discussed to be supported, as reflected, for example, in 3GPP TR 38.801 v14.0.0 "Study on new radio access technology: Radio access architecture and interfaces". There is. For example, a decentralized deployment scenario (section 5.2 of TR 38.801; centralized deployment is presented in section 5.4, which is incorporated herein by reference) is presented therein; may deploy base stations that support 5G NR. Figure 2 depicts an exemplary decentralized deployment scenario and is illustrated in Figure 5.2 of TR 38.801, cited above. 1, but additionally shows a user equipment (UE) and an LTE eNB connected to both a gNB and an LTE eNB. As mentioned above, new eNBs for NR 5G may be illustratively referred to as gNBs.

Additionally, as mentioned above, the 3rd Generation Partnership Project New Radio (3GPP NR) considers three use cases that are expected to support a wide variety of services and applications by IMT-2020 (recommendation). (See ITU-R M.2083: IMT Vision - “Framework and overall objectives of the future development of IMT for 2020 and beyond”, September 2015). Specifications for Phase 1 of Advanced Mobile Broadband (eMBB) were finalized by 3GPP in December 2017. In addition to further expanding eMBB support, current and future work will involve standardization for ultra-reliable and low-latency communications (URLLC) and large-scale machine-type communications. Figure 3 (from Recommendation ITU-R M.2083) shows some examples of possible usage scenarios for IMT from 2020 onwards.

URLLC use cases have stringent requirements on capabilities such as throughput, latency, and availability, and are ideal for future vertical applications such as wireless control of industrial manufacturing or production processes, remote surgery, power distribution automation in smart grids, transportation safety, etc. It is envisioned as one of the enablers for Current WID (Work Item Description) RP-172115 agrees to support ultra-high reliability for URLLC by identifying technologies that meet the requirements set by TR 38.913.

For NR URLLC in Release 15, key requirements include a target user plane delay of 0.5ms for UL (uplink) and 0.5ms for DL (downlink). A typical URLLC requirement for a single transmission of a packet is a BLER (block error rate) of 1E-5 for a packet size of 32 bytes with a user plane of 1 ms. From a RAN1 perspective, reliability can be improved in several possible ways. Current scope for improving reliability is captured in RP-172817, including definition of a separate CQI table for URLLC, more compact DCI format, PDCCH repetition, etc. However, as NR becomes more stable and evolves, the scope may widen to achieve ultra-high reliability (Key requirements for NR URLLC are incorporated herein by reference). (See also 3GPP TR 38.913 V15.0.0 "Study on Scenarios and Requirements for Next Generation Access Technologies"). Therefore, the NR URLLC in Release 15 needs to be able to transmit 32 byte data packets within a user plane delay of 1 ms with a success rate corresponding to a BLER of 1E-5. Rel. Specific use cases for NR URLC in 15 include augmented reality/virtual reality (AR/VR), e-health, e-safety, and mission-critical applications (see also ITU-R M.2083-0). ).

Furthermore, the technology enhancements targeted by NR URLLC in Release 15 aim to improve latency and improve reliability. Technological enhancements for delay improvement include configurable numerology, non-slot-based scheduling with flexible mapping, grant-free (configured grants) uplink, slot-level repetition for data channels, and downlink preemption. including. Preemption is when a transmission for which resources have already been allocated is stopped and the already allocated resources are used for another transmission that is later requested but has lower delay requirements/higher priority requirements. means. Thus, transmissions that have already been authorized will be preempted by later transmissions. Preemption is applicable regardless of the specific service type. For example, a transmission for service type A (URLLC) may be preempted by a transmission for service type B (eMBB, etc.). Technology enhancements for reliability improvements include dedicated CQI/MCS tables for a target BLER of 1E-5 (such technology enhancements are described in 3GPP TS 38. 211 “NR; Physical channels and modulation”, TS 38.212 “NR; Multiplexing and channel coding”, TS 38.213 “NR; Physical layer procedures for control”, and TS 38.214 “NR; Physical layer procedures for data” (respective version V15.2.0)).

The mMTC use case is characterized by a large number of connected devices that typically transmit relatively small amounts of non-delay sensitive data. The device is required to be inexpensive and have a very long battery life. From the NR point of view, utilizing a very narrow bandwidth portion is one possible solution to save power from the UE point of view and enable long battery life.

As mentioned above, it is expected that the scope of reliability in NR will become wider. One key requirement for all cases, which is particularly necessary for URLLC and mMTC, is high or very high reliability. Several mechanisms can be considered to improve reliability from a radio and network perspective. There are only a few potentially key areas that can help improve reliability. Among these areas are compact control channel information, data/control channel repetition, and diversity in the frequency domain, time domain, and/or spatial domain. These areas are generally applicable to reliability, regardless of the specific communication scenario.

NR URLLC Rel. Further use cases with more stringent requirements have been identified for 16, such as factory automation, transportation industry, and power distribution (RP-181477 "New SID on Physical Layer Enhancements for NR URLLC", which is incorporated herein by reference). ”, Huawei, HiSilicon, Nokia, Nokia Shanghai Bell). These more stringent requirements depend on the use case: higher reliability (up to 10 ⁻⁶ levels), higher availability, packet size up to 256 bytes, time synchronization on the order of a few μs (the value of which is , which can be 1 μs or a few μs depending on the frequency range) and short delays on the order of 0.5-1 ms (in particular, a target user plane delay of 0.5 ms) (incorporated herein by reference). See also 3GPP TS 22.261 “Service requirements for next generation new services and markets” V16.4.0 and RP-181477).

Furthermore, Rel. For NR URLLC in 16, several technology enhancements from the RAN1 perspective have been identified. Among these are PDCCH expansion associated with compact DCI, PDCCH (Physical Downlink Control Channel) repetition, and increased PDCCH monitoring. Further, UCI (Uplink Control Information) extensions are related to enhanced HARQ (Hybrid Automatic Repeat Request) and CSI feedback extensions. Additionally, PUSCH extensions and retransmission/repetition extensions related to minislot level hopping are identified. The term "minislot" refers to a Transmission Time Interval (TTI) that includes fewer symbols than a slot (a slot that includes 14 symbols).

Generally, TTI defines the timing granularity for scheduling assignments. One TTI is the time interval during which a given signal is mapped to the physical layer. Traditionally, TTI lengths can vary from 14 symbols (slot-based scheduling) to 2 symbols (non-slot-based scheduling). Downlink and uplink transmissions are specified to be organized into frames (10 ms duration) of 10 subframes (1 ms duration). In slot-based transmission, subframes are divided into slots. The number of slots is defined by the numerology/subcarrier spacing, and the values specified range between 10 slots for a subcarrier spacing of 15 kHz and 320 slots for a subcarrier spacing of 240 kHz. The number of OFDM symbols per slot is 14 for regular cyclic prefixes and 12 for extended cyclic prefixes (as per 3GPP TS 38.211 V15.0.0, incorporated herein by reference). 2017-12), sections 4.1 (general frame structure), 4.2 (Numerologies), 4.3.1 (frames and subframes), and 4.3.2 (slots)). However, the allocation of time resources for transmission may be non-slot based. In particular, TTIs in non-slot-based assignments may correspond to minislots rather than slots. That is, one or more minislots may be assigned to the requested transmission of data/control signaling. For non-slot-based assignments, the minimum length of a TTI may conventionally be 2 OFDM symbols.

Other identified enhancements relate to scheduling/HARQ/CSI processing timelines and UL inter-UE Tx prioritization/multiplexing. Exemplary methods such as UL configured grant (grant-free) transmission focused on improved configured grant behavior, explicit HARQ-ACK, guaranteeing K repetitions and minislot repetition within a slot and other MIMO (Multiple Input Multiple Output) related extensions are further specified (see also 3GPP TS 22.261 V16.4.0).

This disclosure also addresses the use cases identified in (RP-181477 "New SID on Physical Layer Enhancements for NR URLLC", Huawei, HiSilicon, Nokia, Nokia Shanghai Bell) to further improve reliability/latency. related to potential Layer 1 extensions for other requirements related to Specifically, enhancements to PUSCH (Physical Uplink Shared Channel) repetition are discussed. The influence of the proposed ideas in this disclosure is as follows: Rel. It is expected that the main scope of the new SI/WI (work item) for NR URLLC in 16 will be the PUSCH repeat extension.

(PUSCH repeat)
One of the scopes for potential expansion relates to minislot repetition of PUSCH within a slot. In the following, we provide a motivation to support PUSCH repetition within a slot, which may allow potential enhancements to the repetition mechanism to further improve reliability and/or delay to meet the new requirements of NR URLLC. is provided.

To achieve the delay requirements for URLLC PUSCH transmission, one-shot transmission (ie, single (TTI) assignment) is ideal if reliability requirements are met. However, the target BLER of 1E-5 is not necessarily achieved with one-shot transmission. Therefore, a retransmission or repeat mechanism is required. NR Rel. In 15, both retransmissions and repetitions are supported to achieve the target BLER when one-shot transmission is not sufficient. It is well known that HARQ-based retransmissions improve overall reliability by using feedback information to improve subsequent retransmissions depending on channel conditions. However, retransmissions incur additional delays due to feedback processing timelines. Therefore, repetition is useful for delay-tolerant services because it performs subsequent transmissions of the same data packet without waiting for feedback.

PUSCH repetition may be defined as "transmitting the same uplink data packet multiple times without waiting for feedback of one or more previous transmissions of the same data packet." The advantage of PUSCH repetition is that no feedback is required, thus improving overall reliability and reducing delay compared to HARQ. However, link adaptation is generally not possible and resource usage may be inefficient.

NR Rel. 15 introduces limited support for repetition. Only repeating quasi-static configurations are allowed. Furthermore, repetition is only allowed between slots (slot-level PUSCH repetition), as shown in Figure 4. That is, repetition is only possible in slots following the slot of the previous transmission. Depending on the numerology and service type (eg URLLC, eMBB), the delay between repeats may be too long for inter-slot repeats. This type of repetition is mainly useful for PUSCH mapping type A, which allows PUSCH transmission to start only from the beginning of the slot. Such limited support is provided by NR Rel. It may not be possible to achieve the more stringent delay requirements in 15, i.e., a delay of up to 0.5 ms. Therefore, the repetition of PUSCH within a slot is the same as Rel. 16 is considered.

Repetition within the same slot may be supported for PUSCH mapping type B allowing scheduling of a given transmission (or from any symbol of the slot, as opposed to only the beginning of the slot in PUSCH mapping type A). (repetition). For example, two repetitions may be scheduled adjacently within a slot, as shown in FIG. This results in lower delay between repeats compared to inter-slot repeats. In this figure, a single transmission consists of 1 DMRS symbol and 3 data symbols, followed by exactly the same repetition.

However, it can be shown that exactly the same configuration is achieved even with a single transmission without repetition. Basically, the initial transmission length is longer and additional DMRS symbols are configured. This is explained in NR Rel. As shown in FIG. 6, an additional DMRS is assigned to the fifth symbol of the slot. In the example shown in FIG. 6, a single transmission consists of one front-end DMRS plus one additional DMRS configuration and 6 data symbols, which is substantially the same as in the repeating case.

Thus, supporting repetition within the same slot may be considered to provide the same functionality as may be achieved by a single transmission with a longer TTI (transmission time interval) length. Therefore, better functionality should be implemented to support and specify repetition of PUSCH within a slot, with additional flexibility and advantages that cannot be achieved by the existing support for PUSCH transmission.

It is therefore desirable to improve minislot repetition within a slot to provide additional flexibility and benefits not possible with a single assignment. Therefore, for PUSCH mapping type B, repetition of PUSCH within the same slot is supported only if additional functionality is realized with further flexibility and advantages compared to the existing support for PUSCH transmission. It is the proposal of the present disclosure that this should be done.

Repetition within such a slot appears to provide similar functionality to a single assignment. However, if this is combined with other existing physical layer technologies, further flexibility with better benefits may be realized. Below, some possible use cases are described that can only be realized if repetition within slots is supported.

For PUSCH mapping type B, frequency diversity gain can be further exploited if frequency hopping between repetitions is allowed within a slot. This gives the flexibility to schedule each iteration over more than one hop depending on the size of the bandwidth portion, as shown in FIG. Basically, more configurations are possible compared to a single transmission within a slot. Inter-frequency hopping may refer to hopping between subcarrier blocks that include, for example, 12 subcarriers (corresponding to the size of a resource block in the frequency domain). However, frequency hopping can also refer to bandwidth fractional hopping. According to Section 4.4.5 of TS 38.211 V15.0.0 (2017-12), the bandwidth part (or carrier bandwidth part) is , a set of contiguous physical resource blocks defined in Section 4.4.4.3, selected from a subset of contiguous common resource blocks defined in Section 4.4.4.2.

Another advantage of using repetition within a slot is that each repetition can be transmitted in a different beam to achieve further spatial diversity gain not possible in the case of a single transmission, as shown in Figure 8. It is. Beamforming allows the energy of a given radio transmission to be concentrated in one direction, thus extending the range, for example to compensate for high propagation losses at high frequencies. For example, if one transmission and three repetitions are allowed within a slot, up to four different beams can be utilized for each transmission, thus providing additional spatial diversity and potentially improved reliability can be obtained.

In a configured grant (also known as grant-free) PUSCH, all allocated resources for the PUSCH may or may not belong to the uplink. Only symbols designated as UL may be used. Therefore, it may occur that the number of symbols designated as UL is not sufficient or not consecutive to allow longer PUSCH transmissions. Therefore, as shown in Figure 9, a shorter PUSCH can be scheduled more efficiently, and its repetition within a slot takes advantage of the non-consecutive symbols available for the uplink. Can be done.

For PUSCH mapping type B, intra-slot repetitions (i.e. the entire series of initial transmissions and repetitions performed in a single slot) can be used for frequency hopping, beam hopping, etc. by exploiting frequency diversity and spatial diversity, respectively. It is a finding of this disclosure that the present invention can be combined with other physical layer technologies to provide better flexibility and benefits. Furthermore, it is observed that for PUSCH mapping type B with configured grants, repetition within a slot allows efficient use of measurement resources with a small number of UL symbols.

In conventional iterations, the same transport block (TB) is sent in the initial transmission and every iteration rounds with the same DMRS settings. However, this may result in an optimal lower bound in terms of DMRS overhead. For example, as shown in FIG. 10, for 2-symbol PUSCH with initial transmission and 6 repetitions, the DMRS overhead is 50%, which is very high. For each repetition round, a minislot consists of one data symbol and one DMRS symbol within the TTI in question, which is very inefficient in terms of resource usage. This is because the DMRS symbols are very frequent over the slot period during which all initial transmissions and repetitions are performed.

It is thus recognized that conventional repetition can result in very large DMRS overhead in certain scenarios where the PUSCH length is very short. In other words, each repetition round corresponding to one of the subsequent TTIs/minislots consists of one data symbol and one DMRS symbol, which is very inefficient in terms of resource usage. It is. This is because DMRS symbols are very frequent over the slot period. Therefore, it is desirable to improve minislot repetition within a slot to improve delay and/or reliability compared to conventional repetition mechanisms.

On the other hand, even for high mobility UEs (ie, UEs that move at high speeds and therefore require frequent adaptation to rapidly changing channel characteristics), such a dense DMRS is not necessarily required.

In view of the above findings and considerations, the present disclosure provides for modifying or changing the DMRS allocation/DMRS symbol allocation in at least one of the repetitions configured by a signaling mechanism in minislot repetitions of data within a slot. I would like to suggest that you make it possible to do so. To this end, proposed transmitting devices, receiving devices, transmitting methods, and receiving methods are described in the following aspects and embodiments of the present disclosure.

Although the above motivation referred to the context of PUSCH repetition and further referred to NR URLLC as a service type, this disclosure is not limited to any particular service type or communication channel/link. Please note that. In particular, as will be shown in the following description, the present disclosure is applicable to downlink as well as uplink cases.

Generally, the present disclosure provides a transmitting device 1110 in a communication system, particularly a wireless communication system, that transmits data over a channel (eg, a wireless channel) to a receiving device 1160. The transmitting device 1110 shown in FIG. 11 includes a processing circuit 1130 and a transceiver 1120. During operation, the processing circuit allocates data to multiple transmission time intervals (TTIs). Each of the multiple TTIs includes fewer symbols than slots. Here, the data allocated to each of the plurality of TTIs is the same. In addition to data, a demodulation reference signal (DMRS) is assigned to the initial TTI of the multiple TTIs. Further, in operation, circuit 1130 obtains, for each subsequent TTI of the plurality of TTIs that follows the initial TTI, a DMRS assignment indicating whether DMRS is assigned to that TTI. In this disclosure, a device or device part that is adapted or configured to perform a given task is referred to as "in operation" and performs the given task. According to the described operation, the processing circuit 1130 includes a DMRS allocation acquisition unit 1231 and a DMRS/data allocation unit 1232, as shown in FIG. The DMRS allocation acquisition unit 1231 acquires a DMRS allocation during operation. The DMRS/data allocation unit 1232 allocates data to a plurality of TTIs, allocates DMRS to the initial TTI, and allocates or does not allocate DMRS to subsequent TTIs according to the DMRS allocation acquired by the DMRS allocation acquisition unit 1231.

DMRS assignment is an assignment scheme or assignment setting for a TTI that indicates whether DMRS is assigned to this TTI. That is, the DMRS assignment indicates whether DMRS is assigned to this TTI to be transmitted in the TTI in addition to data. Accordingly, if the DMRS assignment for one of the subsequent TTIs indicates that DMRS should be transmitted in this subsequent TTI, then the DMRS is assigned to this subsequent TTI. However, if the DMRS assignment indicates that DMRS should not be transmitted in this TTI, then DMRS is not assigned to this TTI.

A transmitting device transceiver 1120 (i.e., hardware of a transmitting device and/or a receiving device that is adapted to transmit/receive a wireless signal and modulate/demodulate data allocated to time and frequency resources of the wireless signal) During operation, transmitters and receivers (meaning components and software components) transmit data assigned to multiple TTIs to a receiving device in slots. Further, transceiver 1120 transmits the DMRS assigned to the initial TTI in the initial TTI and performs DMRS transmission in one or more subsequent TTIs according to the obtained DMRS assignment. That is, on the one hand, DMRS and data are transmitted in subsequent TTIs to which DMRS is assigned. On the other hand, in subsequent TTIs where DMRS is not allocated, DMRS is not transmitted and data is transmitted.

The present disclosure further provides a receiving device 1160 that receives data from a transmitting device 1110 over a channel (eg, a wireless channel) in a communication system, such as a wireless system. Receiving device 1160 includes circuitry 1180 and transceiver 1170. In operation, circuitry 1180 of the receiving device obtains a DMRS assignment for each subsequent TTI of one or more subsequent TTIs, ie, each subsequent TTI subsequent to the initial TTI. Each TTI, including the initial TTI and subsequent TTIs, has fewer symbols than slots. The data assigned to each TTI of the plurality of TTIs is the same. According to the above description, the DMRS assignment for a TTI indicates whether DMRS is assigned to this TTI to be received in addition to data. During operation, the transceiver 1170 of the receiving device 1160 receives data assigned to the initial TTI and data assigned to the DMRS and one or more subsequent TTIs in slots from the transmitting device. DMRS reception in one or more subsequent TTIs is performed according to the DMRS assignment.

Corresponding to the above-described transmitting device 1110 and receiving device 1160, the transmitting method and receiving method shown in FIG. 13 are provided, respectively. Both the transmitting and receiving methods include an obtaining step (S1310, S1360) of obtaining a demodulation reference signal (DMRS) assignment for each subsequent TTI of one or more subsequent TTIs following the initial TTI. DMRS assignment indicates whether DMRS is assigned to the subsequent TTI to be transmitted in addition to data. Each of the TTIs, including the initial TTI and one or more subsequent TTIs, includes fewer symbols than slots. The transmission method allocates the same data in each TTI of the plurality of TTIs, allocates DMRS in the initial TTI, and, if indicated by the DMRS allocation, DMRS in one or more of the one or more subsequent TTIs. The method further includes an allocating step (S1320) of allocating. The transmitting method further includes a transmitting step (S1330) of transmitting the data and DMRS assigned to the initial TTI and the data assigned to one or more subsequent TTIs to the receiving device. Here, DMRS transmissions in one or more subsequent TTIs are performed according to the DMRS assignment. The receiving method includes a receiving step (S1370) of receiving data assigned to an initial TTI and a DMRS and data assigned to one or more subsequent TTIs within a slot from a transmitting device. Here, DMRS reception in one or more subsequent TTIs is performed according to the DMRS assignment.

As mentioned above, the data and possibly the reference signals are each allocated to a transmission time interval (TTI) that is each smaller than a slot. Accordingly, the present disclosure is particularly relevant to non-slot-based allocations as described above. As mentioned above, for non-slot-based assignments, the minimum length of a TTI may conventionally be 2 OFDM symbols. Such a two-symbol TTI is shown in FIG. A TTI smaller than a slot is referred to in this disclosure as a minislot. However, this does not limit the disclosure to such terms. In particular, due to the small size of the minislot TTI, a series of repetitions including an initial transmission in the first two symbols (i.e., 1 DMRS symbol and 1 data symbol) and 6 repetitions each containing 1 DMRS symbol and 1 data symbol. fits in the slot, so the entire series of repetitions is done within a single slot. Furthermore, the present disclosure also accommodates TTIs in which DMRS is not allocated, ie, TTIs that do not include DMRS symbols. Therefore, if a DMRS symbol is removed from a minislot with only one data symbol, the minimum size of the TTI will be one symbol instead of two symbols as previously assumed.

Within a DMRS assigned TTI/minislot, a DMRS assigned (DMRS) symbol precedes one or more symbols on which data is transmitted. DMRS is used for channel estimation for coherent demodulation at the receiver side. In general, a TTI may also include multiple DMRS symbols for DMRS retransmissions, preceding one or more data symbols on which data is transmitted.

However, in scenarios where the channel characteristics are not expected to change during the duration of one or two minislots such that coherent demodulation is impaired, the DMRS symbol is inserted in the first TTI before one or more subsequent TTIs. It may be sufficient to allocate, but not allocate DMRS for one or more subsequent TTIs. That is, in such a case, DMRS is not transmitted in at least one of the one or more subsequent TTIs/minislots following the initial TTI. This non-assignment of DMRS for subsequent TTIs within a slot may be done in use cases where the transmitting device is expected to be stationary or moving slowly, such as, for example, factory automation.

An example of flexible DMRS allocation for data repetition is shown in FIG. This figure shows a slot containing 14 symbols. The first 10 symbols of this slot are occupied by a series of initial transmissions and repetitions. The initial transmission in the initial minislot corresponds to the first two symbols, followed by six data repetitions in six subsequent TTIs. In the first and fourth repetitions, further DMRS are transmitted, ie, the first and fourth subsequent minislots both contain DMRS symbols in addition to data symbols. Therefore, the DMRS assignments of the first and fourth subsequent TTIs indicate that DMRS is transmitted in these TTIs, respectively. On the other hand, according to the respective DMRS assignments of the plurality of TTIs corresponding to the second, third, fifth, and sixth iterations, no DMRS is assigned to any of these TTIs.

Advantages of the transmitting/receiving device and transmitting/receiving method of the present disclosure include flexible allocation of DMRS to minislots, such as flexible removal and/or replacement of DMRS in one or more data repetitions as described below. DMRS allocation and non-allocation enable a configuration with additional advantages that are not possible with a single allocation (i.e., the same DMRS allocation for each recurring TTI) due to the limited nature of existing DMRS configurations. It's about getting.

As previously mentioned, the DMRS allocation scheme for minislots (i.e., TTIs with fewer symbols than slots) is such that DMRS (including the first symbol in sequence). Therefore, DMRS allocation is also referred to as DMRS symbol allocation in this disclosure. Further details regarding possible DMRS symbol allocations are provided below. In particular, if the DMRS symbol assignment for at least one TTI in a slot specifies that DMRS is not assigned to that TTI, how data is assigned to each symbol of a TTI in a slot is explained. be done.

So far, it has been explained that in a series of DMRS repetitions in mini-slots within one slot, no DMRS is assigned to the particular TTI in which the data repetition is performed. In particular, changing flexible DMRS allocation or DMRS symbol allocation according to some embodiments of the present disclosure may mean:
- One or more DMRS symbols in a given repetition are removed and only one or more data symbols are transmitted in each TTI corresponding to the given repetition. Flexible removal of one or more DMRS symbols in one or more repetitions achieves the final target BLER compared to conventional repetitions (i.e., repetitions in which DMRS is allocated to each TTI in which repetitions occur) This can make it easier to reduce delays.
- one or more DMRS symbols in a given repetition are replaced with one or more data symbols, and the transport block (TB) corresponding to the data to be transmitted has a reduced coding rate with respect to the initial transmission; Sent in Flexible permutation of one or more DMRS symbols in one or more repetitions can facilitate increased reliability compared to conventional repetitions.
- Combined removal and replacement of one or more DMRS symbols. This can facilitate providing both delay and reliability improvements compared to conventional iterations.

(Removal of DMRS)
According to some embodiments, the DMRS assignment further indicates that if a DMRS is not assigned to a TTI, the length of this TTI is reduced by one or more symbols corresponding to the DMRS. This means that in TTIs where DMRS is not allocated, one or more DMRS symbols are removed.

Therefore, one possible extension to conventional iterations is to allow the flexibility to remove DMRS from particular iterations depending on channel conditions and reliability requirements. As an example, in the case of a 2-symbol PUSCH with initial transmission and 6 repetitions, if it is allowed to remove DMRS from a particular repetition, one of the possibilities is shown in Fig. 14. The above allocation of data and DMRS to TTI looks like this. This flexibility not only makes it possible to control DMRS overhead, but also allows NR Rel. This provides additional flexibility in terms of DMRS configuration, which is currently not supported in X.15. Moreover, by allowing such flexibility, overall delays are also reduced.

A repeat round without DMRS corresponding to a minislot/TTI without DMRS symbols uses the last available DMRS for channel estimation. In particular, the second and third iterations are without DMRS; they use DMRS from the first iteration for demodulation. Similarly, the fifth and sixth iterations are without DMRS, and they use the DMRS from the fourth iteration for demodulation.

Regarding demodulation performance, there should be negligible difference for repetitions without DMRS, especially in applications with low mobility requirements for transmitting devices such as UEs. This is because the interval with the last available DMRS from the previous iteration is still rather small. Furthermore, the same MCS (modulation and coding scheme), in particular the same coding rate, may be used in each repetition round of the initial data transmission and the repetition round. This is because the same amount of data symbols, eg, one data symbol per transmission, is available in each subsequent TTI of the initial TTI and one or more subsequent TTIs.

Such a configuration (particularly data/DMRS allocation to symbols within one slot) is not possible according to currently supported DMRS configurations for a single allocation. For such a configuration, performance may be similar or improved compared to the current configuration for a single transmission.

Furthermore, compared to conventional iterations, the same reliability can be obtained with reduced delay. For example, as shown in FIG. 14, the delay is reduced by 4 symbols.

Furthermore, resources (particularly time-domain resources) can be saved relative to conventional iterations. In conventional repetition, all 14 symbols of a slot are used for a series of initial transmissions and 6 repetitions, but according to this embodiment, some symbols in a slot (e.g., as shown in FIG. The last 4 symbols of the slot) may not be used by the series of initial transmissions and repetitions and may be used for other transmissions, e.g. other URLLC traffic in the queue for the same or other UEs.

Therefore, especially with respect to PUSCH mapping type B mentioned above, in intra-slot repetitions for PUSCH mapping type B, removing DMRS from a particular repetition round reduces DMRS overhead and provides further flexibility in terms of DMRS configuration. It is a further finding of the present disclosure that it is possible to provide. This is explained in NR Rel. 15 is currently not possible. An additional finding is that for within-slot repetitions for PUSCH mapping type B, removing DMRS from a particular repetition round reduces the overall delay and frees up resources within the pipeline, e.g., URLLC/eMBB. It is also possible to make it available for other traffic.

(Replacement of DMRS)
According to some embodiments, the DMRS allocation for a subsequent TTI of one or more subsequent TTIs is: if a DMRS is not allocated for this subsequent TTI that is smaller than a slot, then It is further shown that the symbol of is replaced with the symbol for the allocation of data. In other words, in the minislot, DMRS symbols are replaced with data symbols.

An example assignment of DMRS and data to symbols of a TTI within a slot is shown in FIG. 15, where DMRS symbols are replaced with data symbols. This slot includes 7 minislots, each minislot containing 2 symbols. The first (initial) minislot in which the initial PUSCH transmission is performed and the subsequent TTIs in which data for the first, third, and fifth repetitions are allocated are 1 DMRS symbol and 1 data, respectively. Contains symbols. However, the second, fourth, and sixth iterations are each without data symbols. In the TTIs corresponding to these repetitions, the DMRS is each replaced with a data symbol. Thus, each of the second, fourth, and sixth subsequent minislots includes two data symbols instead of one DMRS symbol followed by one data symbol.

The DMRS allocation scheme for repetitions within a slot reduces the MCS (i.e., coding rate) in a particular repetition to improve coding gain and avoids increasing the spacing between data symbols and DMRS. By doing so, the principle for maintaining desired demodulation performance can be applied. As can be seen from FIG. 15, in a TTI with 2 symbols, when a DMRS symbol is replaced by a data symbol, the number of symbols available for transmission is doubled. Furthermore, in each iteration, the same data is transmitted. Therefore, in the two-symbol example, the coding rate is essentially reduced to half the coding rate of the initial data transmission in every iteration where a modification (i.e., replacement of a DMRS symbol with a data symbol) is applied. can be done. However, since the present disclosure is not limited to TTIs with two symbols, the reduced coding rate is the same as the original coding rate at which data is encoded in the initial TTI and subsequent TTIs including DMRS symbols. It is also possible to take a value other than half of .

A configuration such as that illustrated in FIG. 15 obtains similar or even better performance in a configuration where DMRS symbols are replaced by data symbols compared to a single allocation, which is not possible according to the current DMRS configuration. Can be done. Furthermore, compared to conventional iterations, reliability can be further improved while keeping the delay the same.

As mentioned above, DMRS symbols may be removed or replaced from particular TTIs within a slot. For example, within a single slot or a series of slots, changes in DMRS symbol assignments may be limited to either removing DMRS symbols or replacing DMRS symbols. That is, within such a slot, if a DMRS is not assigned to one or more subsequent TTIs, only removal or only replacement is performed. However, the removal and replacement of DMRS symbols may be combined for different TTIs within a single slot, as described in the embodiments below.

(combination of removal and replacement)
For example, in accordance with some embodiments, the DMRS assignment may include that if a DMRS is not assigned to a TTI, the length of this TTI is reduced by one symbol corresponding to the DMRS (DMRS symbol removal); , that the symbol for DMRS allocation in this TTI is replaced with a symbol for data allocation (DMRS symbol replacement). Thus, among one or more subsequent TTIs in which data is repeatedly transmitted within a slot, DMRS symbol removal occurs in one of the subsequent TTIs and DMRS symbol substitution occurs in another one of the subsequent TTIs. Settings are possible that apply to TTIs regardless of the chronological order of these TTIs. That is, the TTI in which the DMRS symbol is removed may precede the TTI in which the DMRS symbol is replaced in transmission order, or vice versa.

A slot is shown in FIG. 16 in which both removal and replacement of DMRS symbols are performed in different TTIs included in the slot. Specifically, the second and fifth subsequent minislots in which the second and fifth iterations are performed are without DMRS symbols, and the lengths of these minislots are adjusted accordingly. reduced. The third and sixth subsequent minislots corresponding to the third and sixth repetitions are also without DMRS symbols, and in these minislots the DMRS symbols are replaced with further data symbols. Ru. For the third and sixth iterations, each containing 2 data symbols, the code rate can be reduced by half, as described above. Furthermore, as can be further seen from this figure, the last two symbols of the slot in time order are not used for the series of initial transmissions and repetitions, and are therefore available for other traffic in the pipeline.

Such mixed use of DMRS symbol removal and replacement of DMRS symbols with data symbols can facilitate increased reliability and reduce delay relative to conventional repetition. Removal of DMRS symbols can provide delay improvement, whereas replacement of DMRS symbols with reduction in coding rate can facilitate increased reliability, but a combination of these embodiments provides greater flexibility and allows trade-offs between different objectives.

As mentioned above, in some embodiments, if symbols for DMRS assignments in a TTI are replaced with symbols for data assignments, data is transmitted in this TTI compared to the data transmitted in the initial TTI. The data is transmitted at a code rate lower than the code rate (or encoding rate) of the data. For example, as shown, the lower code rate may be half the code rate at which the data transmitted in the initial TTI/minislot is encoded, but this disclosure reduces the code rate by half. It is not limited to reducing the Alternatively, if the initial TTI includes 2 data symbols and 1 DMRS symbol and the subsequent TTI includes 3 data symbols and no DMRS symbols, the encoding rate is 3 times lower than the encoding rate used in the initial transmission. can be reduced to 2. As mentioned above, the aforementioned reduction in the coding rate is to be understood as being relative to the coding rate of the data in the initial TTI, rather than reducing the absolute coding rate 1 by, for example, 1/2. That is, the aforementioned reduction in the coding rate is independent of the original value of the coding rate.

(uplink transmission and repetition)
Several examples were shown where a series of initial transmissions and repetitions constitute uplink transmissions, such as PUSCH (Physical Uplink Shared Channel) transmissions. Thus, in some embodiments, the transmitting device 1110 (specifically, the operational transceiver 1120 of the transmitting device 1110) transmits data on the uplink to the receiving device, and the transmitting device 1110's transceiver 1120 further receives control signaling from receiving device 1160. In response, receiving device 1160 transmits control signaling to the transmitting device.

The control signaling includes an allocation indicator indicating a respective DMRS allocation for each subsequent TTI. Transmitting device circuitry 1130 obtains the DMRS assignment for each TTI subsequent to the initial TTI by evaluating the control signaling.

In embodiments where the transmitting device 1110 transmits data on the uplink to the receiving device 1160, the transmitting device may be a terminal or user equipment, and the receiving device 1160 is an LTE (Long Term Evolution) or LTE-Advanced system. It may be a base station called gNB or gNodeB in the NR (New Radio) communication system, which corresponds to eNodeB (eNB). Data transmission on the uplink may correspond to an initial PUSCH transmission and one or more repetitions.

An uplink transmission method and an uplink reception method according to the present disclosure are shown in FIG. 17. As shown, the gNB corresponding to the receiving device 1160 obtains the DMRS through a decision step S1760 (which embodies step S1360 of FIG. 13) to determine the DMRS allocation. Specifically, such determination of DMRS allocation is performed based on channel quality estimation. Specifically, the base station may estimate the channel quality based on uplink sounding reference signals (SRS) transmitted by the UE for the purpose of channel quality estimation. The gNB may receive SRSs from one or more UEs and determine a DMRS assignment based on channel conditions corresponding to estimated channel quality based on the received SRSs.

The gNB/base station then generates a DMRS allocation indicator and sends control signaling including the DMRS allocation indicator to the (user) terminal in step S1765. The user terminal receives control signaling including a DMRS allocation indicator, thereby obtaining a DMRS allocation, in step S1710 (embodiing step S1310 of FIG. 13). The assignment step S1320 and the transmission step S1330 of the uplink transmission method and the reception step S1370 of the uplink reception method are performed according to the corresponding general method shown in FIG. 13.

(control signaling)
Specifically, in some embodiments, the DMRS allocation indicator for each subsequent TTI of the one or more subsequent TTIs is a 2-bit allocation indicator. Two bits are sufficient to indicate whether DMRS is assigned to the TTI and further indicate whether the option of DMRS removal or DMRS replacement is applied. Thus, each repetition may be respectively associated with one of the following two-bit indications:
- "00": no change to one or more DMRS symbols in a given iteration (i.e. DMRS is assigned to a TTI)
- '01': One or more DMRS symbols are removed and the TTI length of a given repetition is reduced - '10': One or more DMRS symbols are replaced with one or more data symbols and the TTI length of a given repetition is - "11": Reserved entry

According to the 2-bit indication above, the DMRS allocation indicator for 6 iterations consists of 6 2-bit indicators. In the example combination of DMRS symbol removal and substitution shown in FIG. 16, the resulting 12-bit indicator would be "00 01 10 00 01 10". This indicator is also shown in FIG.

Obviously, the association between 2-bit values and DMRS assignments is merely exemplary. Alternatively, for example, "10" may represent DMRS symbol removal.

Alternatively, the DMRS allocation indicator may have more or less than two bits. Specifically, the DMRS allocation indicator for each subsequent TTI transmitted within a slot may be a 1-bit indicator, such that the DMRS allocation indicator for up to 6 retransmissions of DMRS allocation indicator It becomes a bit field. For example, it is not clear or known from the standard or from further control signaling what specific changes are to be made to the assignment in the TTI (e.g. whether removal or substitution of DMRS symbols is performed). If so, the 1-bit indicator corresponding to the TTI is sufficient to indicate whether a DMRS is assigned to this TTI. For example, a bit value of "0" may indicate that DMRS is assigned to and transmitted in a TTI, and a bit value of "1" indicates that the DMRS symbol is replaced or removed. Regardless of whether the DMRS is assigned, it can be indicated that the DMRS is not allocated. Therefore, the resulting 6-bit DMRS allocation indicator for all six iterations would be "011011" in the example shown in FIG. 14 (removal) and "011011" in the example shown in FIG. 15 (replacement). Then, it becomes "010101". Again, the values ``0'' and ``1'' may be reversed, where the value ``1'' signifies the assignment of DMRS to the TTI.

For example, a DMRS allocation indicator (eg, the 1-bit indicator or 2-bit indicator described above for each TTI) may be included in the upper level signaling. Therefore, the DMRS assignment is signaled quasi-statically, specifically in RRC (Radio Resource Control) signaling.

In some embodiments, the control signaling further includes a DMRS enablement indicator that indicates whether DMRS is not assigned to any of the one or more subsequent TTIs. Therefore, the DMRS enablement indicator, which may be a 1-bit indicator, determines whether a flexible repeat setting (whether DMRS is assigned or not assigned to subsequent TTIs, plus the type of case in which it is not assigned) is applied. It can be shown that In other words, the DMRS enable indicator is set to disable or enable flexible DMRS configuration. Furthermore, selection of a particular DMRS enablement indicator can indicate a degree of flexibility in DMRS allocation.

Specifically, the DMRS enablement indicator may be a 1-bit indicator that indicates whether flexible DMRS is applied within a slot or within a longer time interval that includes several slots ( For example, the activation indicator may be signaled semi-statically, as described below). For example, a "0" indicates that flexible recurrence, which allows DMRS not to be assigned to a particular TTI, does not apply, and a "1" indicates that flexible recurrence applies (or vice versa). ). A 1-bit enable indicator may be used in combination with a respective 2-bit indicator for a particular group of TTIs in the series of repeats described above. For example, if the DMRS enable indicator indicates that flexible DMRS is applied, the 2-bit indicator indicates whether DMRS allocation is applied, DMRS removal is applied, or , can specify whether DMRS replacement is applied.

Alternatively, a 1-bit enable indicator may indicate whether DMRS removal or DMRS replacement is applied (e.g., "0" indicates removal and "1" indicates replacement). . In this case, whether DMRS is not allocated (specifically removed or replaced depending on the value of the DMRS enablement indicator) may be indicated by a 1-bit DMRS allocation indicator for each TTI.

The activation indicator may be included in higher layer signaling. Alternatively, the activation indicator may be considered as dynamic signaling for conveying scheduling information (grants) and/or transmission parameters, for example downlink control information (DCI) (i.e. physical downlink control channel (PDCCH)). ) may be included in physical layer control signaling messages transmitted on The present disclosure is not limited to a particular DCI format; the format may correspond to an existing/specified DCI format for NR, or in the future for specific services of types such as URLLC. Sometimes it is agreed upon. On the other hand, including the activation indicator in the DCI provides greater flexibility as enabling/disabling of the DMRS allocation can be performed using grants for a flexible series of data repetitions. On the other hand, signaling the enablement indicator in higher layer signaling rather than in DCI may avoid introducing additional DCI signaling and thus incurring DCI signaling overhead. However, if a DMRS allocation indicator is included in the DCI, advantageously a 1-bit allocation indicator is used.

The control signaling and activation indicators described above, including the DMRS allocation indicators for each TTI, constitute a signaling mechanism that can be implemented only with RRC signaling (semi-static configurability). On the other hand, the signaling mechanism may be embodied as a combination of both RRC signaling and DCI signaling, as explained below.

If the configuration of DMRS allocation/enablement is performed by RRC signaling only, two bit fields (referred to as "bit field 1" and "bit field 2" in this disclosure) are set in any of the repetition rounds. Complete flexibility to allow removal or substitution of DMRS symbols (i.e., flexibly specifying in what order each removal, substitution, or assignment is performed within a series of iterations). It can be possible.

Bit field 1 may correspond to the 1-bit enable indicator described above that indicates whether flexible repeat settings are applied. The exact repeat setting (DMRS allocation) is configurable by bit field 2, which corresponds to a 2-bit allocation indicator provided for each TTI. For bit field 2, the maximum number of bits is twice the maximum allowed number of repetitions. For example, if a maximum of 6 repetitions is allowed, a 12-bit field is defined in RRC to allow flexible repetition settings. Each repetition (ie, each subsequent TTI) is associated with two bits with an indication as listed above in the description of the DMRS allocation indicator. Therefore, returning to the combined DMRS removal and DMRS replacement example shown in FIG. 2 takes the value "00 01 10 00 01 10" as described above and shown in FIG.

As an alternative to Bitfield 1 being a 1-bit field and Bitfield 2 being a field of up to 12 bits, a 1-bit enable indicator indicating whether DMRS substitution or DMRS removal is applied may be used as described above. may be combined with a 1-bit DMRS allocation indicator for each subsequent TTI. As a further alternative, a 2-bit enable indicator as described above may be combined with a respective 1-bit allocation indicator. In the latter signaling mechanism, a bit field 2 of up to 12 bits may be reduced by half a bit to a field of up to 6 bits. Therefore, resources in RRC signaling are saved.

Further, in accordance with this disclosure, signaling of one or more DMRS assignments for each TTI corresponding to a repetition may be performed without bit field 1. Specifically, control signaling related to DMRS assignments may only include DMRS assignment indicators. However, if the enable indicator is included in the RRC control signaling and indicates the value '0' (flexible repetition is not applied), bit field 2 need not be signaled in the same RRC signaling and the bit It may be reused or saved for indications other than DMRS allocation.

As an alternative to control signaling for DMRS allocation/enablement in RRC only, the signaling mechanism may include both RRC signaling and DCI signaling. Such embodiments may allow for some degree of DMRS allocation dynamics.

Specifically, a field called "Bit Field 1" may be moved to the DCI. That is, whether the 1-bit field corresponding to one of the 1-bit enable indicators mentioned above is subject to flexible repeat settings (in this case still configurable by the RRC bit field). added to the DCI to dynamically signal whether the value is "0"). If control signaling in RRC and control signaling in DCI are combined, the RRC bit field in the RRC signaling may be the same as "bit field 2" described above for RRC only use. Therefore, although the repeating configuration pattern (i.e., DMRS allocation for each subsequent TTI) is the same, its application (i.e., enabling (disabling) "toggling" flexible DMRS allocation on or off) is different from DCI. This is done dynamically via

The 1-bit field in the DCI may be a 1-bit enablement indicator that specifies enabling or disabling flexible DMRS allocation, as described above. In this case, a bit field in the RRC signaling may include a 2-bit DMRS allocation indicator (up to (up to 12 bits). However, a 1-bit field in the DCI may also correspond to the above-mentioned indicator indicating whether DMRS removal or DMRS replacement is applied. In this case, the DMRS allocation indicator may have one bit for each subsequent TTI (up to 6 bits for up to 6 repetitions), as described above. As a further alternative, the type of symbol assignment (replacement or deletion) when a DMRS is not assigned repeatedly may be predefined, for example by a standard. In this case, a 1-bit enable indicator in the DCI and a 1-bit DMRS allocation indicator for each subsequent TTI (eg, 6 bits corresponding to 6 repetitions) is sufficient.

(Further embodiments)
Some of the embodiments above were described specifically in relation to uplink transmission/repetition. However, as already mentioned, the present disclosure is not limited to the uplink case, but may be used for PDSCH repetition. Therefore, in some embodiments, the transmitting device rather than the receiving device corresponds to the gNB. The transmitting device generates a DMRS assignment indicator and optionally an enablement indicator and transmits control signaling including the DMRS assignment indicator to the receiving device (ie, (user) terminal). The receiving device receives the DMRS allocation indicator (and optionally the enabling indicator) and further receives the data in the initial TTI and performs the DMRS allocation according to the DMRS allocation indicated by the received DMRS allocation indicator (and optionally the enabling indicator). , receives DMRS in a subsequent TTI. Here, the activation indicator and the allocation indicator may correspond to any of the indicators described above for the uplink case.

Furthermore, it is noted that the present disclosure is directed to enabling flexibility in the time domain. The allocation of data and DMRS to carriers or subcarriers, ie to resources in the frequency domain of an OFDM system, or to other resources such as spatial resources (beams) is not affected by the DMRS allocation.

However, the flexibility in iterations as described in this disclosure may also be utilized in frequency hopping, beam hopping, and small measurement resource scenarios, as shown in FIGS. 19-21. The same phase is used to utilize the DMRS from the last available transmission for channel estimation in the current repetition round. For frequency hopping, channel estimation can be done from the last available DMRS at the same hop. Similarly for beam hopping, channel estimation can be done from the last available DMRS in the same beam.

Accordingly, in some embodiments, as shown in FIG. 19, during operation, the transceiver transmits data allocated to each subsequent TTI of one or more The TTI transmits on a different set of subcarriers than the set of subcarriers on which data was transmitted in the immediately preceding TTI. In other words, in two of the TTIs, data is assigned to different sets of subcarriers and transmitted on different sets of subcarriers. The set of subcarriers may correspond to 12 subcarriers corresponding to the resource block size in the frequency domain, or may correspond to the bandwidth portions mentioned above. Therefore, frequency hopping may occur before each subsequent TTI in which a DMRS is assigned. However, if frequency hopping is performed from one of the TTIs to the next TTI, the data in the TTI after the frequency hopping step/operation is The DMRS is transmitted on the set of subcarriers on which it was transmitted in the previous TTI. In FIG. 19, frequency hopping between two respective frequency groups/sets is performed.

Similar to frequency hopping as described above, in some embodiments, as shown in FIG. The data is transmitted in a beam different from the beam in which the data was transmitted in the TTI immediately before the subsequent TTI among the TTIs. That is, data is transmitted in different beams in two of the plurality of TTIs. As with frequency hopping, in each TTI, data is transmitted on a beam on which data was previously transmitted in another one of the TTIs. In the beam hopping example shown in FIG. 20, beam hopping is performed between two different beams.

Beam changes or frequency changes from one TTI to the next may be signaled quasi-statically. For example, in addition to DMRS assignment indicators, RRC signaling may also include beam hopping pattern indicators or frequency hopping pattern indicators. Additionally, the DCI or RRC may include a beam hopping activator and/or a frequency hopping indicator. Alternatively, for cases where flexible DMRS allocation is enabled, predetermined hopping patterns may be defined in the standard.

In some further embodiments, the multiple TTIs that data is allocated to be transmitted in the initial transmission and in the repetitions are not consecutive. That is, a symbol that is not included in any of the plurality of TTIs exists between two of the plurality of TTIs. That is, other data and/or control signaling that is different from the data assigned to each TTI of the plurality of TTIs may be assigned to symbols between two TTIs of the plurality of TTIs. An example is shown in FIG. In FIG. 21, within a slot, there is an initial PUSCH transmission and three data repetitions, and the DMRS is assigned to the TTI corresponding to the initial transmission and the second repetition. However, during each of these TTIs there are symbols that are not used for the same series of initial transmissions and repetitions. Moreover, these symbols in between are symbols that are not used for uplink transmission.

Furthermore, in most of the examples shown, the initial transmission begins with the DMRS assigned to the first symbol of the slot. However, especially in accordance with the PUSCH mapping type B described above, the present disclosure is not limited to the initial TTI containing the first symbol in a slot in time order. Alternatively, the initial transmission may begin with a symbol other than the first symbol in the slot.

The present disclosure can be implemented by software, by hardware, or by software cooperating with hardware. Part or all of each functional block used in the description of each embodiment described above can be realized by an LSI such as an integrated circuit, and each process described in each embodiment can be implemented partly or completely by an LSI such as an integrated circuit. All can be controlled by the same LSI or a combination of LSIs. LSIs can be formed individually as chips, or one chip can be formed to include some or all of the functional blocks. The LSI can include a data input/output section coupled to itself. LSIs are sometimes referred to as ICs, system LSIs, super LSIs, or ultra LSIs depending on the degree of integration. However, the technology for realizing an integrated circuit is not limited to LSI, but can be realized by using a dedicated circuit, a general-purpose processor, or a dedicated processor. Furthermore, it is also possible to use an FPGA (field programmable gate array) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connections and settings of circuit cells arranged inside the LSI. The present disclosure can be implemented as digital or analog processing. If, as a result of advances in semiconductor technology or another derivative technology, LSI replaces future integrated circuit technology, then that future integrated circuit technology may be used to integrate functional blocks. Biotechnology can also be applied.

According to one general aspect, the present disclosure provides a transmitting device that transmits data to a receiving device in a communication system, the transmitting device comprising, during operation, an initial transmission time interval (TTI) and one or more subsequent TTIs following the initial TTI. further allocating a demodulation reference signal (DMRS) to the initial TTI, and for each subsequent TTI of the one or more subsequent TTIs, the DMRS, in addition to the data A circuit for obtaining a DMRS assignment indicating whether to be assigned to a subsequent TTI to be transmitted, wherein each of the plurality of TTIs includes fewer symbols than slots; the data assigned to each TTI is the same, in operation, within the slot, the data assigned to the initial TTI and the data assigned to the DMRS and the one or more subsequent TTIs; DMRS transmission in the one or more subsequent TTIs is performed according to the DMRS assignment.

This provides greater flexibility for repetition and facilitates enabling reduced delay and/or enhanced reliability.

For example, DMRS is not transmitted in at least one subsequent TTI of the one or more subsequent TTIs.

In some embodiments, the DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by one symbol corresponding to the DMRS.

This makes it easier to reduce delays.

In another embodiment, the DMRS assignment specifies that if a DMRS is not assigned for the subsequent TTI, symbols for the assignment of the DMRS in the subsequent TTI are replaced with symbols for the assignment of data. Further shown.

This makes it easy to enhance reliability.

In a further embodiment, the DMRS allocation is such that if no DMRS is assigned to the subsequent TTI, the length of the subsequent TTI is reduced by one symbol corresponding to the DMRS; It further indicates that the symbol for the DMRS assignment is replaced with the symbol for the data assignment.

This facilitates reducing delays and enhancing reliability.

For example, if a symbol for the allocation of the DMRS in the subsequent TTI is replaced with a symbol for the allocation of the data, the data is transmitted in the subsequent TTI with the symbol in which the data was transmitted in the initial TTI. It is transmitted at a code rate lower than the code rate.

For example, the transmitting device transmits the data to the receiving device on an uplink, and the transceiver, during operation, further transmits the data from the receiving device to the one or more subsequent TTIs. receiving control signaling including a DMRS allocation indicator indicative of a DMRS allocation, the circuit, during operation, obtaining the DMRS allocation for each subsequent TTI of the one or more subsequent TTIs by evaluating the control signaling; .

For example, the DMRS allocation indicator for each subsequent TTI is a 2-bit allocation indicator.

In some embodiments, the DMRS allocation indicator is included in higher layer signaling.

For example, the control signaling further includes an enablement indicator indicating whether DMRS is not assigned to any of the one or more subsequent TTIs.

In some example embodiments, the activation indicator is included in higher layer signaling.

This results in avoiding additional physical layer signaling overhead.

In another exemplary embodiment, the activation indicator is a 1-bit indicator included in downlink channel information (DCI).

This allows dynamic switching of flexible DMRS allocation.

In some embodiments, the transmitting device transmits the data to the receiving device on a downlink, and the transceiver, during operation, further transmits the data for each subsequent TTI of the one or more subsequent TTIs. Control signaling including a DMRS assignment indicator indicating a DMRS assignment is transmitted to the receiving device.

For example, in two TTIs of the plurality of TTIs, the data is assigned to different sets of subcarriers and transmitted on the different sets of subcarriers.

For example, in two of the plurality of TTIs, the data is transmitted in different beams.

In some embodiments, a symbol between two TTIs of the plurality of TTIs is not included in any of the plurality of TTIs.

According to another general aspect, a receiving device that receives data from a transmitting device in a communication system, wherein during operation, for each subsequent TTI of one or more subsequent TTIs following an initial transmission time interval (TTI); A circuit for obtaining a DMRS assignment indicating whether a demodulation reference signal (DMRS) is assigned to the subsequent TTI to be received in addition to the data, the circuit comprising: a plurality of TTIs, including a subsequent TTI, each including a fewer number of symbols than slots, a DMRS is assigned to the initial TTI, and the data assigned to each TTI of the plurality of TTIs is the same; , in operation, a transceiver that receives from the transmitting device, within the slot, the data assigned to the initial TTI and the DMRS and the data assigned to the one or more subsequent TTIs; A receiving device further comprising a transceiver is provided, wherein DMRS reception in the one or more subsequent TTIs is performed according to the DMRS assignment.

For example, DMRS is not transmitted in at least one subsequent TTI of the one or more subsequent TTIs.

In some embodiments, the DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by one symbol corresponding to the DMRS.

In another embodiment, the DMRS assignment specifies that if a DMRS is not assigned for the subsequent TTI, symbols for the assignment of the DMRS in the subsequent TTI are replaced with symbols for the assignment of data. Further shown.

In a further embodiment, the DMRS allocation is such that if no DMRS is assigned to the subsequent TTI, the length of the subsequent TTI is reduced by one symbol corresponding to the DMRS; It further indicates that the symbol for the DMRS assignment is replaced with the symbol for the data assignment.

For example, if a symbol for the allocation of the DMRS in the subsequent TTI is replaced with a symbol for the allocation of the data, the data is transmitted in the subsequent TTI with the symbol in which the data was transmitted in the initial TTI. It is transmitted at a code rate lower than the code rate.

For example, the receiving device receives the data from the transmitting device on an uplink and further transmits control signaling including a DMRS allocation indicator indicating the DMRS allocation for each subsequent TTI of the one or more subsequent TTIs. Send to sending device.

For example, the DMRS allocation indicator for each subsequent TTI is a 2-bit allocation indicator.

In some embodiments, the DMRS allocation indicator is included in higher layer signaling.

For example, the control signaling further includes an enablement indicator indicating whether DMRS is not assigned to any of the one or more subsequent TTIs.

In some example embodiments, the activation indicator is included in higher layer signaling.

In another exemplary embodiment, the activation indicator is a 1-bit indicator included in downlink channel information (DCI).

In some embodiments, the receiving device receives the data from the transmitting device on a downlink, and the transceiver, during operation, further transmits data from the transmitting device to each of the one or more subsequent TTIs. For subsequent TTIs, the circuit receives control signaling including a DMRS allocation indicator indicating the DMRS allocation, and in operation, the circuit determines the control signaling for each of the one or more subsequent TTIs by evaluating the control signaling. Obtain a DMRS assignment.

For example, in two TTIs of the plurality of TTIs, the data is allocated to different sets of subcarriers and received on the different sets of subcarriers.

For example, in two of the plurality of TTIs, the data is received in different beams.

In some embodiments, a symbol between two TTIs of the plurality of TTIs is not included in any of the plurality of TTIs.

In another general aspect, the present disclosure provides a transmission method for a transmitting device transmitting data to a receiving device in a communication system, the transmission method comprising: obtaining, for a subsequent TTI, a DMRS assignment indicating whether a demodulation reference signal (DMRS) is allocated for the subsequent TTI to be transmitted in addition to the data; a plurality of TTIs, each including one or more subsequent TTIs, each containing fewer symbols than slots; and assigning the same data to each TTI of the plurality of TTIs; and transmitting, within the slot, the data assigned to the initial TTI and the DMRS and the data assigned to the one or more subsequent TTIs to the receiving device; DMRS transmission in one or more subsequent TTIs is performed in accordance with the DMRS assignment.

For example, DMRS is not transmitted in at least one subsequent TTI of the one or more subsequent TTIs.

In some embodiments, the DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by one symbol corresponding to the DMRS.

In another embodiment, the DMRS assignment specifies that if a DMRS is not assigned for the subsequent TTI, symbols for the assignment of the DMRS in the subsequent TTI are replaced with symbols for the assignment of data. Further shown.

In a further embodiment, the DMRS allocation is such that if no DMRS is assigned to the subsequent TTI, the length of the subsequent TTI is reduced by one symbol corresponding to the DMRS; It further indicates that the symbol for the DMRS assignment is replaced with the symbol for the data assignment.

For example, if a symbol for the allocation of the DMRS in the subsequent TTI is replaced with a symbol for the allocation of the data, the data is transmitted in the subsequent TTI with the symbol in which the data was transmitted in the initial TTI. It is transmitted at a code rate lower than the code rate.

For example, the data is transmitted on an uplink to the receiving device, and the transmission method includes a DMRS allocation indicator indicating the DMRS allocation for each subsequent TTI of the one or more subsequent TTIs from the receiving device. Further comprising receiving control signaling, in the obtaining step, the DMRS assignment is obtained for each subsequent TTI of the one or more subsequent TTIs by evaluating the control signaling.

For example, the DMRS allocation indicator for each subsequent TTI is a 2-bit allocation indicator.

In some embodiments, the DMRS allocation indicator is included in higher layer signaling.

For example, the control signaling further includes an enablement indicator indicating whether DMRS is not assigned to any of the one or more subsequent TTIs.

In some example embodiments, the activation indicator is included in higher layer signaling.

In another exemplary embodiment, the activation indicator is a 1-bit indicator included in downlink channel information (DCI).

In some embodiments, the data is transmitted to the receiving device on a downlink, and the transmission method includes a DMRS allocation indicator indicating the DMRS allocation for each subsequent TTI of the one or more subsequent TTIs. The method further includes transmitting control signaling to the receiving device.

For example, in two TTIs of the plurality of TTIs, the data is assigned to different sets of subcarriers and transmitted on the different sets of subcarriers.

For example, in two of the plurality of TTIs, the data is transmitted in different beams.

In some embodiments, certain symbols between two TTIs of the plurality of TTIs are not included in any of the plurality of TTIs.

According to another general aspect, the present disclosure provides a receiving method for a receiving device receiving data from a transmitting device in a communication system, the receiving method comprising: receiving data from an initial transmission time interval (TTI) followed by one or more subsequent TTIs. obtaining, for each subsequent TTI, a DMRS assignment indicating whether a demodulation reference signal (DMRS) is allocated to that subsequent TTI to be received in addition to the data, the initial TTI and The plurality of TTIs, including the one or more subsequent TTIs, each include fewer symbols than slots, and the DMRS is assigned to the initial TTI and the data assigned to each TTI of the plurality of TTIs is the same. and receiving from the transmitting device, within the slot, the data assigned to the initial TTI and the DMRS and the data assigned to the one or more subsequent TTIs. DMRS reception in the one or more subsequent TTIs is performed according to the DMRS assignment.

For example, DMRS is not transmitted in at least one subsequent TTI of the one or more subsequent TTIs.

In some embodiments, the DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by one symbol corresponding to the DMRS.

In another embodiment, the DMRS assignment specifies that if a DMRS is not assigned for the subsequent TTI, symbols for the assignment of the DMRS in the subsequent TTI are replaced with symbols for the assignment of data. Further shown.

In a further embodiment, the DMRS allocation is such that if no DMRS is assigned to the subsequent TTI, the length of the subsequent TTI is reduced by one symbol corresponding to the DMRS; It further indicates that the symbol for the DMRS assignment is replaced with the symbol for the data assignment.

For example, if a symbol for the allocation of the DMRS in the subsequent TTI is replaced with a symbol for the allocation of the data, the data is transmitted in the subsequent TTI with the symbol in which the data was transmitted in the initial TTI. It is transmitted at a code rate lower than the code rate.

For example, the data is received from the transmitting device on an uplink, and the receiving method includes transmitting control signaling that includes a DMRS allocation indicator indicating the DMRS allocation for each subsequent TTI of the one or more subsequent TTIs. further comprising transmitting to the device.

For example, the DMRS allocation indicator for each subsequent TTI is a 2-bit allocation indicator.

In some embodiments, the DMRS allocation indicator is included in higher layer signaling.

For example, the control signaling further includes an enablement indicator indicating whether DMRS is not assigned to any of the one or more subsequent TTIs.

In some example embodiments, the activation indicator is included in higher layer signaling.

In another exemplary embodiment, the activation indicator is a 1-bit indicator included in downlink channel information (DCI).

In some embodiments, the data is received from the transmitting device on a downlink, and the receiving method indicates the DMRS assignment for each of the one or more subsequent TTIs from the transmitting device. further comprising receiving control signaling including a DMRS allocation indicator, wherein in the obtaining step, the DMRS allocation for each subsequent TTI of the one or more subsequent TTIs is obtained by evaluating the control signaling. be done.

For example, in two TTIs of the plurality of TTIs, the data is allocated to different sets of subcarriers and received on the different sets of subcarriers.

For example, in two of the plurality of TTIs, the data is received in different beams.

In some embodiments, a symbol between two TTIs of the plurality of TTIs is not included in any of the plurality of TTIs.

In summary, the present disclosure relates to a transmitting device that transmits data to a receiving device in a communication system. During operation, a transmitting device allocates data to multiple TTIs, including an initial transmission time interval (TTI) and one or more subsequent TTIs following the initial TTI, and further assigns a demodulation reference signal (DMRS) to the initial TTI. Assignment: For each subsequent TTI of the one or more subsequent TTIs, circuitry is provided to obtain a DMRS assignment indicating whether DMRS is assigned to that subsequent TTI to be transmitted in addition to data. Each of the multiple TTIs includes fewer symbols than slots, and the data assigned to each of the multiple TTIs is the same. The transmitting device further comprises a transceiver that, during operation, transmits data within the slot and transmits DMRS according to a DMRS assignment.

Claims (17)

A transmitting device that transmits data to a receiving device in a communication system, the transmitting device comprising:
In operation, allocating the data to a plurality of TTIs including an initial transmission time interval (TTI) and one or more subsequent TTIs following the initial TTI, allocating a demodulation reference signal (DMRS) to the initial TTI, and A circuit for obtaining a DMRS assignment indicating whether a DMRS is assigned to each of one or more subsequent TTIs, each of the plurality of TTIs being represented by consecutive symbols within a slot. and,
In operation, a transceiver transmitting the data and the DMRS to the receiving device within the slot, wherein transmission of DMRS in the one or more subsequent TTIs is performed according to the DMRS assignment; ,
Equipped with
symbols between the plurality of TTIs are assigned symbols that are not valid for uplink transmission;
sending device. DMRS is not transmitted in at least one subsequent TTI of the one or more subsequent TTIs;
A transmitting device according to claim 1. the DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by one symbol corresponding to the DMRS;
A transmitting device according to claim 1 or 2. The DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, symbols for the assignment of the DMRS in the subsequent TTI are replaced with symbols for the assignment of data;
A transmitting device according to claim 1 or 2. The DMRS assignment is such that if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by one symbol corresponding to the DMRS, or for the assignment of the DMRS in the subsequent TTI. further indicating that the symbol is replaced with a symbol for the allocation of said data;
A transmitting device according to claim 1 or 2. If the symbols for the allocation of the DMRS in the subsequent TTI are replaced by the symbols for the allocation of the data, the data is transmitted in the subsequent TTI at a code rate lower than the code rate at which the data was transmitted in the initial TTI. is also transmitted at a low code rate,
The transmitting device according to claim 4. the transmitting device transmits the data to the receiving device on an uplink;
In operation, the transceiver further receives control signaling from the receiving device, including a DMRS allocation indicator indicating the DMRS allocation for each subsequent TTI of the one or more subsequent TTIs;
the circuit, in operation, obtains the DMRS assignment for each of the one or more subsequent TTIs by evaluating the control signaling;
A transmitting device according to claim 1. the DMRS allocation indicator for each subsequent TTI is a 2-bit allocation indicator;
A transmitting device according to claim 7. the DMRS allocation indicator is included in higher layer signaling;
A transmitting device according to claim 7. The control signaling further includes an enablement indicator indicating whether DMRS is not assigned to any of the one or more subsequent TTIs.
A transmitting device according to claim 7. the activation indicator is included in upper layer signaling;
A transmitting device according to claim 10. the activation indicator is a 1-bit indicator included in downlink control information (DCI);
A transmitting device according to claim 10. A receiving device that receives data from a transmitting device in a communication system, the receiving device comprising:
In operation, a circuit for obtaining a DMRS assignment indicating whether a demodulation reference signal (DMRS) is assigned to each subsequent TTI of one or more subsequent TTIs following an initial transmission time interval (TTI), the circuit comprising: A plurality of TTIs, including the initial TTI and the one or more subsequent TTIs, are each represented by consecutive symbols within a slot, a DMRS is assigned to the initial TTI, and the data is transmitted to each TTI of the plurality of TTIs. a circuit to be assigned;
In operation, a transceiver receives the data and the DMRS from the transmitting device in the slot, wherein reception of DMRS in the one or more subsequent TTIs is performed according to the DMRS assignment. and,
Equipped with
symbols between the plurality of TTIs are assigned symbols that are not valid for uplink transmission;
receiving device. A transmission method for a transmitting device transmitting data to a receiving device in a communication system, the method comprising:
Obtaining a DMRS assignment indicating whether a demodulation reference signal (DMRS) is assigned to each subsequent TTI of one or more subsequent TTIs following an initial transmission time interval (TTI), the initial TTI and obtaining a plurality of TTIs, each of which includes the one or more subsequent TTIs, are represented by consecutive symbols within a slot;
allocating the data to each TTI of the plurality of TTIs and allocating a DMRS to the initial TTI;
transmitting the data and the DMRS to the receiving device within the slot, wherein transmission of DMRS in the one or more subsequent TTIs is performed according to the DMRS assignment;
including;
symbols between the plurality of TTIs are assigned symbols that are not valid for uplink transmission;
How to send. A receiving method for a receiving device receiving data from a transmitting device in a communication system, the method comprising:
Obtaining a DMRS assignment indicating whether a demodulation reference signal (DMRS) is assigned to each subsequent TTI of one or more subsequent TTIs following an initial transmission time interval (TTI), the initial TTI and a plurality of TTIs including the one or more subsequent TTIs, each represented by consecutive symbols in a slot, a DMRS being assigned to the initial TTI, and the data being assigned to each TTI of the plurality of TTIs. obtaining and
receiving the data and the DMRS from the transmitting device in the slot, the reception of DMRS in the one or more subsequent TTIs being performed according to the DMRS assignment;
including;
symbols between the plurality of TTIs are assigned symbols that are not valid for uplink transmission;
How to receive. An integrated circuit for controlling processing of a transmitting device transmitting data to a receiving device in a communication system, the processing comprising:
A process for obtaining a DMRS assignment indicating whether a demodulation reference signal (DMRS) is assigned to each subsequent TTI of one or more subsequent TTIs following an initial transmission time interval (TTI), the process comprising: and obtaining a plurality of TTIs, each of which includes the one or more subsequent TTIs, are represented by consecutive symbols within a slot;
Allocating the data to each TTI of the plurality of TTIs and allocating a DMRS to the initial TTI;
transmitting the data and the DMRS to the receiving device within the slot, wherein transmission of the DMRS in the one or more subsequent TTIs is performed according to the DMRS assignment;
including;
symbols between the plurality of TTIs are assigned symbols that are not valid for uplink transmission;
integrated circuit. An integrated circuit for controlling processing of a receiving device receiving data from a transmitting device in a communication system, the processing comprising:
A process for obtaining a DMRS assignment indicating whether a demodulation reference signal (DMRS) is assigned to each subsequent TTI of one or more subsequent TTIs following an initial transmission time interval (TTI), the process comprising: and a plurality of TTIs including the one or more subsequent TTIs, each including consecutive symbols in slots, a DMRS is assigned to the initial TTI, and the data is assigned to each TTI of the plurality of TTIs. processing and
receiving the data and the DMRS from the transmitting device in the slot, the receiving of the DMRS in the one or more subsequent TTIs being performed according to the DMRS assignment;
including;
symbols between the plurality of TTIs are assigned symbols that are not valid for uplink transmission;
integrated circuit.